Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

what does the below rebus mean?

Find the missing number in the series below

13 -21 34 -55 ? -144

How can you make number one disappear by adding something to it?

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Which alphabet is a part of our body?

Three people check into a hotel. They pay $60 for the rent of the room. After they check-in, the manager realize that the rent for the room is $55. So, he gives $5 to the bellboy and asks him to give it to them. The bellboy thinks that it will be difficult for the three people to share $5 among them and seeking the personal benefit, he pockets $2 and gives the remaining $3 to them.

Now, each person paid $20 and got back $1. In this manner, each of them paid just $19 which totals to the amount of $57. The bellboy has $2 with him and adding them, we get $59. So where is the remaining $1?

Can anyone tell me a word in the English dictionary which has a silent 'z'?